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Finding the Fourth Proportional to 129,371.88, 178,532.46 and 72,783.72

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Solution

The fourth proportional to 129,371.88, 178,532.46 and 72,783.72 is: 100,441.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,371.88 : 178,532.46 = 72,783.72 : x
  2. Step 2: Convert to fraction form
    129,371.88/178,532.46 = 72,783.72/x
  3. Step 3: Cross multiply
    129,371.88x = 178,532.46 × 72,783.72
  4. Step 4: Simplify right side
    129,371.88x = 12,994,256,579.55
  5. Step 5: Solve for x
    x = 12,994,256,579.55/129,371.88
  6. Step 6: Final answer
    x = 100,441.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.